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Stopping the smart TV from being used against you.
(www.s-config.com)
This is a most excellent place for technology news and articles.
There's paint for that: https://ecospaints.net/browse-all/emr-shielding-paint
I've heard blackboard paint works as well: https://smartersurfaces.com/product/black-chalkboard-paint/
I can only imagine how this would totally screw with cell signal and probably generic interference with wanted wireless tech.